Jaywalker_Holmes

Ren, a modern doctor and a secret master magician, suddenly finds himself inside a random book he picked up at the airport...as the villainous older brother of the protagonist. As the bad guy, he's supposed to make life difficult for the Male Lead until the latter grows up and kills him in revenge. However, looking at the broken teenager in front of him, Ren can't help but feel his heart soften. 
Fang was an orphan who had never known what a family is. Abandoned at birth, all he knew was pain and fear. He loved nothing, and wanted nothing...until he saw the angelic Wade. To save Wade, Fang didn't hesitate to sacrifice himself. ..after all, there was no one to cry over him.
But then, Ren appeared and turned his world upside down.

The Villain Saves the Male Lead

"Ren! Are you done yet?" Fang demanded, knocking on the bathroom door.

Ren, who was shaving with an old fashioned razor (it was one of the strange quirks of Ren that was a source of constant amusement for Fang and the others – Ren would always insist on using an old fashioned cut throat razor rather than the modern electric ones which most people did, including Fang), was startled, and his hand slipped, leaving a long cut on his handsome face.

Papa! I smell blood! Daddy's blood! Snow cried immediately, leaping out of Fang's arms and scratching at the bathroom door.

Fang's heart leapt out of his chest in panic. Without waiting for a single extra moment, Fang kicked the bathroom door open and rushed in.

"Ren! Are you hurt?! Where are you hurt?!" he cried anxiously.

Ren, who had a shaving nick (albeit a long one) on his face, blinked at Fang slowly. "What's wrong?" he asked.

95 – Fang Gets Nervous